In August 1977, a satellite（）to gather data about the 10 million black holes which are thought to be in the Milky Way. 选项 A:launched B:was launched C:has been launched D:is launched

In August 1977, a satellite（）to gather data about the 10 million black holes which are thought to be in the Milky Way.
选项
A:launched
B:was launched
C:has been launched
D:is launched

出自：英语一

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